Is it possible to not subscribe to news posts by default?

When I post a reply to a news item the default is to subscribe me to the thread so I get notifications of other posts. I can tick the box off, but I need to remember to do that every time I post. I'd like to know how it's possible to make it off by default. If there's anything that can turn me off posting it's automatic subscription to thread.

Thanks. I was sure there's such an option, but couldn't find it. Now I have. It was set to automatically subscribe, and I don't know how that happened, since I'm sure I never got subscriptions to news items. Maybe it was set like this all along and just recently applied to posting on the news pages. Anyway now that it's off I hope that I won't get these pesky messages. Thanks a lot.